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PHP Basic Tutorial for Getting Started with PHP Array Exercises (2)

WBOYOriginal: 2016-07-25 09:00:161030browse

This section introduces you to the exercises of PHP arrays and uses an example of averaging with a one-dimensional array for your reference.

Requirements: Enter 5 numbers in the input box (separate the 5 numbers with spaces), please use a one-dimensional array to write a program to find their average (retaining 2 decimal places).

Review: Basic tutorial for getting started with php - php array exercises

The code is as follows:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
</head>
<body>
<h3>请输入5个数，并且用空格隔开_bbs.it-home.org</h3>
<?php
/**
 * php 数组练习
*/
    //接收提交(输入过来的值) REQUEST

    $grade =@$_REQUEST['grade'];
    //echo $grades;

    //拆分成数组
    $grades = explode(" ",$grade);

    //print_r($grades);
    //定义一个变量存放总数
    $total=0;
    //计算总分
    for($i=0;$i<count($grades);$i++){
    
        $total +=$grades[$i];    
    }
    
    //round函数 保留小数位||这是四舍五入法保留2位小数
    //echo '平均数为：'.round($total/count($grades),2);
?>

<form action="array01.php" method="post">
    请输入:<input type="text" name="grade" value="<?php echo $grade;?>">
    <input type="submit" value="请提交">
</form>
<?php
    //number_format()函数 是保留位数，同时格式化数字加千位符
    echo '平均数为：'.number_format($total/count($grades),2);
    //echo '平均数为：'.round($total/count($grades),2);
?>
</body>
</html>

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